Climatic variations over time and space

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1 Climatic variations over time and space MJ Harris August 2003

2 Aims To understand that climate varies over different time scales: Millions of years Thousands of years Hundreds of years Seasonally/Annually Daily (Diurnally)

3 Geological time - millions of years Name three geological periods when conditions were warmer than today. Name two geological periods when conditions were colder than today. What evidence would you need to look at to investigate past temperature?

4 Thousand of of years The graph shows global temperature trends over the last 8,000 years. Identify three periods when temperatures were higher than today. What has been the range of temperature variation over the last 8,000 years? Give some examples of how differences in temperature have affected man s activities.

5 Hundreds of years ( ) The graph shows global average surface temperatures from 1860 to 2000 Describe the overall trend of the graph. Comment on the variations.

6 climateprediction.net - graphs Phase 1 ( pre-industrial) This is the calibration phase and the temperature of the ocean is artificially held constant. Phase 2 ( ) This is the control phase CO 2 levels in the model are kept constant at pre-industrial levels of 282 ppm. The temperature of the ocean is allowed to vary according to how much energy the ocean receives and emits. Phase 3 ( ) CO 2 levels are doubled and then held constant.

7 CO 2 doubling/temperature What does this model run suggest will happen to global temperatures (red line) if CO 2 levels are doubled in 2050? What state would probably be reached after about 10 years?

8 CO 2 doubling/cloud cover What does this model run suggest could happen to global cloud cover (red line) if CO 2 levels were doubled in 2050? Suggest a possible explanation?

9 CO 2 doubling/precipitation What does this model run suggest could happen to global precipitation (red line) if CO 2 levels are doubled in 2050? However there are likely to be large regional variations.

10 Seasonal/annual The climograph shows average climatic data for London, UK Which month is the warmest and what is the temperature? Why? Which month is the coldest and what is the temperature? Why? Comment on the pattern of rainfall throughout the year. Describe and suggest explanations for the pattern of sunshine throughout the year.

11 Timinou London Daily The graph shows diurnal temperature variations on a November day for Timinou, Sahara (top dashed line 0 Longitude, 30 Latitude) and London, UK (solid bottom line 0 Longitude, 52 Latitude). Describe the diurnal temperature variations for each location. Suggest reasons for the differences between the two locations. Now use your own data to repeat this exercise for two other contrasting locations.

12 Climate also varies spatially (over space) at different scales Global Continental National Regional Local

13 Climateprediction.net - maps Climateprediction.net plots maps at various scales to show predicted temperature, cloud, precipitation and snowfall at various stages of the model. The above map shows global variations in temperature (March, April, May) at the pre-industrial phase ( )

14 Maps. The following maps of temperature, precipitation, snowfall and cloud cover are plotted for the Pre- Industrial phase ( ) of the climateprediction.net model. The seasons refer to the northern hemisphere: Winter December, January, February Spring March, April, May Summer June, July, August Autumn - September, October, November

15 Winter v Summer temperature Winter Study the winter temperature map (left) Describe the distribution of global temperature. Why are temperatures so low in central Asia and northern Russia? Why are temperatures so high in Australia? Summer Study the summer temperature map (right) What has happened to the band of highest temperature (the thermal equator)? Why is there little seasonal change in ocean temperature?

16 Summer precipitation Study the map of summer precipitation. Where is the highest daily rate of precipitation? What factors explain this high rate of precipitation during the summer season. Describe the benefits and problems of high rates of precipitation.

17 Winter snowfall Study the map of winter snowfall. Which hemisphere has most winter snowfall? Why? What factors might explain the high rate of snowfall in Western Canada? Describe the benefits and problems of high rates of snowfall.

18 Summer % cloud cover Study the map of summer cloud cover. Describe and explain the areas which have a) highest b) lowest % cloud cover. What role do clouds play in the energy budget?

19 Global temperatures 2050 This figure shows the Met Office s best guess at predicted changes in temperature by 2050 relative to the present day. Describe the patterns. Why are land areas likely to warm up faster than the oceans?

20 Likely effects of global warming as predicted by the IPCC

21 Impacts on atmosphere and hydrosphere The diagram shows identified changes in atmospheric and hydrological characteristics resulting from global warming. What changes have been identified in the following: Ocean temperature Sea-levels Cloud type and amount Snow cover CO 2 levels

22 Continental scale - Africa The animated image shows diurnal (daily) variations in temperature across the continent of Africa. Which regions of Africa have the highest temperatures? Why?

23 Climatic change at a national and regional scale The map shows one prediction of weather changes in the UK by the year What impact may these predicted changes have in the following areas: South-East England? Coastal areas? Describe some of the positive and negative impacts of the changes. What management plans may be needed to cope with the impacts?

24 Climatic variations - local scale Source LLBL Heat Island Group The diagram shows a temperature transect across a city. Describe the temperature transect. Why are temperatures higher in the centre of most cities? Describe and explain how cities may influence other climatic characteristics e.g. rainfall amount and intensity, wind speed, cloudiness, frequency of fog/smog and air quality.

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